问题
I have an application running on Android to connect and view the IP Camera. Now I'm trying to add PTZ support to application.
Below are the requirements for PTZ.
1) When user drags the screen to any coordinates on the application, IP Camera should move(pan/tilt) accordingly.
2) When user zoom in/out on the particular area of the application, IP Camera should zoom that area.
Problems I'm facing are.
1) I'm not able to map the x,y coordinates of the user action to Onvif pan/tilt vector. Because Onvif pan/tilt vector X and Y value range is -1 to 1 and I don't know how to cover overall area of IP Camera(360degree horizontal 70degree vertical)
2) How to zoom in/out particular area since Onvif zoom vector does not provide way to specify the area(X and Y coordinates to zoom).
来源：https://stackoverflow.com/questions/50565359/ptz-for-onvif-ip-camera